Subject: [PATCH v2] gpio: pl061: convert to use generic irq chip

From: [email-masked] (Rob Herring)
Date: Mon, 02 Jan 2012 10:54:36 -0600

Grant,

On 01/02/2012 02:54 AM, Grant Likely wrote:
> On Mon, Dec 19, 2011 at 02:52:07PM -0600, Rob Herring wrote:
>> From: Rob Herring <[email-masked]>
>>
>> Convert the pl061 irq_chip code to use the generic irq chip code.
>>
>> This has the side effect of using 32-bit accesses rather than 8-bit
>> accesses to interrupt registers. The h/w TRM and testing seem to indicate
>> this is fine.
>>
>> Signed-off-by: Rob Herring <[email-masked]>
>> Acked-by: Grant Likely <[email-masked]>
>> Cc: Linus Walleij <[email-masked]>
> 
> What does this apply against?  It doesn't apply cleanly.
> 

You need the whole series which is available here:

git://sources.calxeda.com/kernel/linux.git pl061-domain-v2

Rob

> g.
> 
>> ---
>> v2:
>> - put struct irq_chip_generic pointer into struct pl061_gpio instead of domain
>> ptr.
>>
>>  drivers/gpio/Kconfig      |    1 +
>>  drivers/gpio/gpio-pl061.c |   74 ++++++++++++++++-----------------------------
>>  2 files changed, 27 insertions(+), 48 deletions(-)
>>
>> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>> index 8482a23..4d433e2 100644
>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -138,6 +138,7 @@ config GPIO_MXS
>>  config GPIO_PL061
>>  	bool "PrimeCell PL061 GPIO support"
>>  	depends on ARM_AMBA
>> +	select GENERIC_IRQ_CHIP
>>  	help
>>  	  Say yes here to support the PrimeCell PL061 GPIO device
>>  
>> diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
>> index fe19dec..96ff6b2 100644
>> --- a/drivers/gpio/gpio-pl061.c
>> +++ b/drivers/gpio/gpio-pl061.c
>> @@ -50,10 +50,10 @@ struct pl061_gpio {
>>  	 * the IRQ code simpler.
>>  	 */
>>  	spinlock_t		lock;		/* GPIO registers */
>> -	spinlock_t		irq_lock;	/* IRQ registers */
>>  
>>  	void __iomem		*base;
>>  	int			irq_base;
>> +	struct irq_chip_generic	*irq_gc;
>>  	struct gpio_chip	gc;
>>  };
>>  
>> @@ -125,40 +125,10 @@ static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
>>  	return chip->irq_base + offset;
>>  }
>>  
>> -/*
>> - * PL061 GPIO IRQ
>> - */
>> -static void pl061_irq_disable(struct irq_data *d)
>> -{
>> -	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
>> -	int offset = d->irq - chip->irq_base;
>> -	unsigned long flags;
>> -	u8 gpioie;
>> -
>> -	spin_lock_irqsave(&chip->irq_lock, flags);
>> -	gpioie = readb(chip->base + GPIOIE);
>> -	gpioie &= ~(1 << offset);
>> -	writeb(gpioie, chip->base + GPIOIE);
>> -	spin_unlock_irqrestore(&chip->irq_lock, flags);
>> -}
>> -
>> -static void pl061_irq_enable(struct irq_data *d)
>> -{
>> -	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
>> -	int offset = d->irq - chip->irq_base;
>> -	unsigned long flags;
>> -	u8 gpioie;
>> -
>> -	spin_lock_irqsave(&chip->irq_lock, flags);
>> -	gpioie = readb(chip->base + GPIOIE);
>> -	gpioie |= 1 << offset;
>> -	writeb(gpioie, chip->base + GPIOIE);
>> -	spin_unlock_irqrestore(&chip->irq_lock, flags);
>> -}
>> -
>>  static int pl061_irq_type(struct irq_data *d, unsigned trigger)
>>  {
>> -	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
>> +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>> +	struct pl061_gpio *chip = gc->private;
>>  	int offset = d->irq - chip->irq_base;
>>  	unsigned long flags;
>>  	u8 gpiois, gpioibe, gpioiev;
>> @@ -166,7 +136,7 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
>>  	if (offset < 0 || offset >= PL061_GPIO_NR)
>>  		return -EINVAL;
>>  
>> -	spin_lock_irqsave(&chip->irq_lock, flags);
>> +	raw_spin_lock_irqsave(&gc->lock, flags);
>>  
>>  	gpioiev = readb(chip->base + GPIOIEV);
>>  
>> @@ -195,18 +165,11 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
>>  
>>  	writeb(gpioiev, chip->base + GPIOIEV);
>>  
>> -	spin_unlock_irqrestore(&chip->irq_lock, flags);
>> +	raw_spin_unlock_irqrestore(&gc->lock, flags);
>>  
>>  	return 0;
>>  }
>>  
>> -static struct irq_chip pl061_irqchip = {
>> -	.name		= "GPIO",
>> -	.irq_enable	= pl061_irq_enable,
>> -	.irq_disable	= pl061_irq_disable,
>> -	.irq_set_type	= pl061_irq_type,
>> -};
>> -
>>  static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
>>  {
>>  	struct list_head *chip_list = irq_get_handler_data(irq);
>> @@ -232,6 +195,25 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
>>  	chained_irq_exit(irqchip, desc);
>>  }
>>  
>> +static void __init pl061_init_gc(struct pl061_gpio *chip, int irq_base)
>> +{
>> +	struct irq_chip_type *ct;
>> +
>> +	chip->irq_gc = irq_alloc_generic_chip("gpio-pl061", 1, irq_base,
>> +					      chip->base, handle_simple_irq);
>> +	chip->irq_gc->private = chip;
>> +
>> +	ct = chip->irq_gc->chip_types;
>> +	ct->chip.irq_mask = irq_gc_mask_clr_bit;
>> +	ct->chip.irq_unmask = irq_gc_mask_set_bit;
>> +	ct->chip.irq_set_type = pl061_irq_type;
>> +	ct->chip.irq_set_wake = irq_gc_set_wake;
>> +	ct->regs.mask = GPIOIE;
>> +
>> +	irq_setup_generic_chip(chip->irq_gc, IRQ_MSK(PL061_GPIO_NR),
>> +			       IRQ_GC_INIT_NESTED_LOCK, IRQ_NOREQUEST, 0);
>> +}
>> +
>>  static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
>>  {
>>  	struct pl061_platform_data *pdata;
>> @@ -269,7 +251,6 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
>>  	}
>>  
>>  	spin_lock_init(&chip->lock);
>> -	spin_lock_init(&chip->irq_lock);
>>  	INIT_LIST_HEAD(&chip->list);
>>  
>>  	chip->gc.direction_input = pl061_direction_input;
>> @@ -293,6 +274,8 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
>>  	if (chip->irq_base <= 0)
>>  		return 0;
>>  
>> +	pl061_init_gc(chip, chip->irq_base);
>> +
>>  	writeb(0, chip->base + GPIOIE); /* disable irqs */
>>  	irq = dev->irq[0];
>>  	if (irq < 0) {
>> @@ -321,11 +304,6 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
>>  			else
>>  				pl061_direction_input(&chip->gc, i);
>>  		}
>> -
>> -		irq_set_chip_and_handler(i + chip->irq_base, &pl061_irqchip,
>> -					 handle_simple_irq);
>> -		set_irq_flags(i+chip->irq_base, IRQF_VALID);
>> -		irq_set_chip_data(i + chip->irq_base, chip);
>>  	}
>>  
>>  	return 0;
>> -- 
>> 1.7.5.4
>>